20546664660 has 96 divisors (see below), whose sum is σ = 64006951680. Its totient is φ = 5471911296.

The previous prime is 20546664637. The next prime is 20546664701. The reversal of 20546664660 is 6646664502.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 392809 + ... + 442031.

It is an arithmetic number, because the mean of its divisors is an integer number (666739080).

Almost surely, 2^20546664660 is an apocalyptic number.

20546664660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20546664660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32003475840).

20546664660 is an abundant number, since it is smaller than the sum of its proper divisors (43460287020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20546664660 is a wasteful number, since it uses less digits than its factorization.

20546664660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50014 (or 50006 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 20546664660 in words is "twenty billion, five hundred forty-six million, six hundred sixty-four thousand, six hundred sixty".